12-d=40

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Solution for 12-d=40 equation: 


Simplifying
12 + -1d = 40

Solving
12 + -1d = 40

Solving for variable 'd'.

Move all terms containing d to the left, all other terms to the right.

Add '-12' to each side of the equation.
12 + -12 + -1d = 40 + -12

Combine like terms: 12 + -12 = 0
0 + -1d = 40 + -12
-1d = 40 + -12

Combine like terms: 40 + -12 = 28
-1d = 28

Divide each side by '-1'.
d = -28

Simplifying
d = -28

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